JZUS - Journal of Zhejiang University SCIENCE

Journal of Zhejiang University SCIENCE B 2005 Vol.6 No.8 P.731-735

http://doi.org/10.1631/jzus.2005.B0731

Magnetic properties and heavy metal contents of automobile emission particulates

Author(s): LU Sheng-gao, BAI Shi-qiang, CAI Jing-bo, XU Chuang
Affiliation(s): School of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310029, China
Corresponding email(s): lusg@zju.edu.cn
Key Words: Automobile emission particulates, Magnetic properties, Heavy metal, Environmental magnetism

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Abstract: Measurements of the magnetic properties and total contents of Cu, Cd, Pb and Fe in 30 automobile emission particulate samples indicated the presence of magnetic particles in them. The values of frequency dependent susceptibility (χ_fd) showed the absence of superparamagnetic (SP) grains in the samples. The IRM_{20 mT} (isothermal remanent magnetization at 20 mT) being linearly proportional to SIRM (saturation isothermal remanent magnetization) (R²=0.901), suggested that ferrimagnetic minerals were responsible for the magnetic properties of automobile emission particulates. The average contents of Cu, Cd, Pb and Fe in automobile emission particulates were 95.83, 22.14, 30.58 and 34727.31 mg/kg, respectively. Significant positive correlations exist between the magnetic parameters and the contents of Pb, Cu and Fe. The magnetic parameters of automobile emission particulates reflecting concentration of magnetic particles increased linearly with increase of Pb and Cu content, showed that the magnetic measurement could be used as a preliminary index for detection of Pb and Cu pollution.

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